# 22 (number)

 ← 21 22 23 →
Cardinaltwenty-two
Ordinal22nd
(twenty-second)
Factorization2 × 11
Divisors1, 2, 11, 22
Greek numeralΚΒ´
Roman numeralXXII
Binary101102
Ternary2113
Senary346
Octal268
Duodecimal1A12

22 (twenty-two) is the natural number following 21 and preceding 23.

## In Mathematics

22 is a semiprime,[1] a Smith number, and an Erdős–Woods number.[2][3] ${\displaystyle {\frac {22}{7}}=3.14{\color {red}28}\ldots }$ is a commonly used approximation of the irrational number π, the ratio of the circumference of a circle to its diameter.

22 can read as "two twos", which is the only fixed point of John Conway's look-and-say function.[4]

The number 22 appears prominently within sporadic groups. The Mathieu group M22 is one of 26 sporadic finite simple groups, defined as the 3-transitive permutation representation on 22 points.[5] There are also 22 regular complex apeirohedra.[6]

## In aircraft

• 22 is the designation of the USAF stealth fighter, the F-22 Raptor.

## In art, entertainment, and media

### In other fields

• Catch-22 (1961), Joseph Heller's novel, and its 1970 film adaptation gave rise to the expression of logic "catch-22".[32]
• Revista 22 is a magazine published in Romania.
• There are 22 stars in the Paramount Pictures logo.[33]
• "Twenty Two" (February 10, 1961) is Season 2–episode 17 (February 10, 1961) of the 1959–1964 TV series The Twilight Zone, in which a hospitalized dancer has nightmares about a sinister nurse inviting her to Room 22, the hospital morgue.
• Traditional Tarot decks have 22 cards with allegorical subjects. These serve as trump cards in the game. The Fool is usually a kind of wild-card among the trumps and unnumbered, so the highest trump is numbered 21. Occult Tarot decks usually have 22 similar cards which are called Major Arcana by fortune-tellers. Occultists have related this number to the 22 letters of the Hebrew alphabet and the 22 paths in the Kabbalistic Tree of Life.
• "22" is the number assigned to the unborn soul who serves as a prominent character in the Pixar film Soul.

## In sports

• In both American football and association football, a total of 22 players (counting both teams) start the game, and this is also the maximum number of players that can be legally involved in play at any given time.
• In men's Australian rules football, each team is allowed a squad of 22 players (18 on the field and 4 interchanges).
• The length of a cricket pitch is 22 yards.
• In rugby union, the "22" is a line in each half of the field which is 22 meters from the respective try line. It has significance in a number of laws particularly relating to kicking the ball away.
• A snooker game (called a "frame") starts with 22 coloured balls at specified locations on the table (15 red balls and 7 others).

## In other uses

Twenty-two may also refer to:

## References

1. ^ Sloane, N. J. A. (ed.). "Sequence A001358". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
2. ^ Sloane, N. J. A. (ed.). "Sequence A006753 (Smith numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31.
3. ^ Sloane, N. J. A. (ed.). "Sequence A059756 (Erdős-Woods numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-31.
4. ^ Sloane, N. J. A. (ed.). "Sequence A010861 (Look-and-say constant sequence 22)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2022-07-21.
5. ^ Weisstein, Eric W. "Mathieu Groups". mathworld.wolfram.com. Retrieved 2022-07-02.
6. ^ Coxeter, H.S.M. (1991), Regular Complex Polytopes, Cambridge University Press, p. 140, ISBN 0-521-39490-2
7. ^ Twenty Two – Karma to Burn | Song Info | AllMusic, retrieved 2020-08-12
8. ^ a b Twenty Two – The Vicar | Song Info | AllMusic, retrieved 2020-08-12
9. ^ Twenty Two – Jordan Sweeney | Song Info | AllMusic, retrieved 2020-08-12
10. ^ Twenty Two – The Good Life | Song Info | AllMusic, retrieved 2020-08-12
11. ^ Twenty Two – Sweet Nectar | Song Info | AllMusic, retrieved 2020-08-12
12. ^ Twenty Two – American Generals | Song Info | AllMusic, retrieved 2020-08-12
13. ^ Twenty Two – Dan Anderson | Song Info | AllMusic, retrieved 2020-08-12
14. ^ Twenty Two – Bad Cash Quartet | Song Info | AllMusic, retrieved 2020-08-12
15. ^ Twenty Two – Millencolin | Song Info | AllMusic, retrieved 2020-08-12
16. ^ Twenty Two – Enter the Worship Circle | Song Info | AllMusic, retrieved 2020-08-12
17. ^ Twenty Two – Blank Dogs | Song Info | AllMusic, retrieved 2020-08-12
18. ^ Twenty Two – Al Candello | Song Info | AllMusic, retrieved 2020-08-12
19. ^ Twenty Two – Amen Dunes | Song Info | AllMusic, retrieved 2020-08-12
20. ^ 22 Two's – Jay-Z | Song Info | AllMusic, retrieved 2020-08-12
21. ^ 22 Acacia Avenue – Iron Maiden | Song Info | AllMusic, retrieved 2020-08-12
22. ^ Catch 22 – Hypocrisy | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-12
23. ^ 22 Dreams – Paul Weller | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-12
24. ^ "Ugress | Album Discography". AllMusic. Retrieved 2020-08-12.
25. ^ Cinematronics – Ugress | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-12
26. ^ Unicorn – Ugress | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-12
27. ^ Number 22 – Ashbury Heights | Song Info | AllMusic, retrieved 2020-08-12
28. ^ 22, A Million – Bon Iver | Songs, Reviews, Credits | AllMusic, retrieved 2020-08-12
29. ^ "Cubic 22 | Songs". AllMusic. Retrieved 2020-08-12.
30. ^ 22 – Deaf Havana | Song Info | AllMusic, retrieved 2020-08-12
31. ^ 22 – Sarah McTernan | Song Info | AllMusic, retrieved 2020-08-12
32. ^ "Definition of CATCH-22". www.merriam-webster.com. Retrieved 2020-08-12.
33. ^ "Paramount Pictures' Logo Started as a Desktop Doodle, and Has Endured for 105 Years". 4 March 2019. Retrieved 2020-08-12.
34. ^ González-Wippler, Migene (1991). The Complete Book of Amulets & Talismans. Llewellyn Worldwide. p. 87. ISBN 978-0-87542-287-9.
35. ^ Sharp, Damian (2001). Simple Numerology: A Simple Wisdom book (A Simple Wisdom Book series). Red Wheel. p. 7. ISBN 978-1-57324-560-9.
36. ^ "Definition of CHAIN". www.merriam-webster.com. Retrieved 2020-08-19. a unit of length equal to 66 feet
37. ^ Cuartas, Javier (1990-01-05). "La suerte de los dos patitos" [The luck of the two little ducks]. El País (in Spanish). Oviedo. Retrieved 17 September 2020.
38. ^ Sanz, Elena (26 April 2010). "Los dos patitos, la niña bonita, la mala pata..." Muy Interesante (in Spanish). Retrieved 17 September 2020. Lo más normal es que el nombre tuviera que ver con la forma del número. Por ejemplo, el 11 era las banderillas, y el 22, los dos patitos o las monjas arrodilladas.